Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/3485#issuecomment-64750295
@sryza the issue is that mqtt-client is not hosted in maven central, it's
maintained in an external repository owned by the eclipse project and also (for
some versions) in a repository maintained by the Spring project. This is really
a bad situation because we are relying on an artifact could simply be removed
at some point in the future without warning and would break any Spark build.
For instance, all Spark 0.9.X builds are now broken because the eclipse
repository removed mqtt-client 0.4.0. If in the future the spring repository
also removes this (the spring repo was added to our build in Spark 1.0) many
versions of Spark will fail to build.
As long as this is in the default build configuration we expose ourself to
this, so I'm proposing removing mqtt from the default build. We should have a
firm policy moving forward that we can't depend on artifacts that aren't hosted
in maven central.
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